Which method of fiber-optic cable installation eliminates the need for pre-installed pulling lines?

The high air speed blowing method stands out as the correct choice for fiber-optic cable installation techniques that eliminate the need for pre-installed pulling lines. This method utilizes a stream of high-velocity air to propel the fiber-optic cable through existing ducts. By employing this air method, the cable can be inserted without the requirement of a pulling line, making the installation process more efficient and less reliant on pre-installed infrastructure.

In contrast, the other methods typically involve some form of pulling lines or require additional setups that can complicate the installation. For example, methods like direct pull or ground-level pulling usually necessitate the use of pulling lines to guide the cable into place, which can add time and labor to the installation process. The aerial pulling method may involve similar challenges, as it often includes securing and manipulating the cable from overhead positions, thereby needing a reliable pulling system.

Thus, the high air speed blowing method provides a distinct advantage by streamlining the installation process without the prerequisite of pulling lines, allowing for quicker and potentially more cost-effective fiber-optic deployments.